Flow injection flame atomic spectrometric determination of iron, calcium, magnesium, sodium and potassium in ceramic materials by using a variable-volume injector

1993 ◽  
Vol 345 (8-9) ◽  
pp. 579-584 ◽  
Author(s):  
M. de la Guardia ◽  
A. Morales-Rubio ◽  
V. Carbonell ◽  
A. Salvador ◽  
J. L. Burguera ◽  
...  
Keyword(s):  
Flow Injection ◽  
Ceramic Materials ◽  
Variable Volume ◽  
Calcium Magnesium ◽  
Sodium And Potassium

Direct determination of therapeutic concentrations of lithium in serum by flow-injection analysis with atomic absorption spectroscopic detection.

1982 ◽  
Vol 28 (3) ◽  
pp. 440-443 ◽  
Author(s):  
B F Rocks ◽  
R A Sherwood ◽  
C Riley
Keyword(s):  
Atomic Absorption ◽  
Flow Injection ◽  
Direct Determination ◽  
Injection System ◽  
Analytical Recovery ◽  
Flow Injection System ◽  
Dilution Effects ◽  
Sodium And Potassium ◽  
Sample Dilution

Abstract In this flow-injection system for direct determination of lithium in serum by atomic absorption spectroscopy, the 10-microL sample is manually injected into a continuously flowing non-segmented stream of de-ionized water, which is pumped, via a dispersion tube, to the spectrometer's nebulizer. Controlled dispersion of the sample zone, before it is introduced into the nebulizer, produces the required sample dilution. Effects of varying the length of the dispersion tube, the flow rate, and the sample size were studied. Analytical readout is obtained, in the form of transient peaks, 5 s after sample injection. It is necessary to include physiological concentrations of sodium and potassium in the standard because each of these cations enhances the lithium absorbance signal. Analytical recovery (98.5 to 101%) and CV (about 2%) are good, and results compare well with those obtained by aspiration of prediluted samples (n = 121, r = 0.99).

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